SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Details)	12 Months Ended
Dec. 31, 2019 USD ($) shares
Significant Accounting Policies
Income tax interest expense or penalties \| $	$ 0
Cash equivalents maturity period	6 months
United States Commodity Index Fund
Significant Accounting Policies
Weighted Average Number of Shares Outstanding, Basic	5
United States Commodity Index Fund \| Creation Baskets \| Effective as of May 1, 2012
Significant Accounting Policies
Weighted Average Number of Shares Outstanding, Basic	50,000
United States Copper Index Fund
Significant Accounting Policies
Weighted Average Number of Shares Outstanding, Basic	40

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Name:	us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration